I took the index of your words, transformed the number to binary, included three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, added three zeros to the eight digits of your binary and bought 00000010011 which interprets to 19 in decimal. https://atozbookmark.com/story18688047/bip39-seed-phrase-mnemonics-generator-an-overview